Car has 144,000, Chrysler installed a crate motor at 70,000. Car has only a CAI, catrch can since 27,000, thermostat, and mid muffler delete. 2013 Charger SRT8 6.4

 

So it's a 6.4 and not a 6.1 lol (since you left that info out)

 

Fiexed

 

So what changed between the two runs that you picked up almost 40 horsepower??

 

The first set of numbers look spot on for RWHP for a '12-'14 392, however the second set is right at the stock flywheel numbers (470/470) for that engine. A CAI, catch can (no performance value whatsoever, strictly longevity), thermostat, and mid muffler delete will not net you 40 RWHP. I find it hard to believe even a custom tune (which you didn't list) would net that much. That smells like a cam swap.